Ardoino da Piacenza
Ardoino da Piacenza (died 21 January 1183) was an Italian cardinal. His first name is listed also as Arduino.
He was archdeacon of the cathedral chapter of Piacenza and member of the Order of Canons Regular de San Frediano di Lucca. Pope Alexander III created him Cardinal in the consistory celebrated in Frascati in 1178. Between 4 July and 6 September 1178 he signed a papal bull as Cardinal-Deacon of S. Maria in Via Lata, but shortly thereafter he was promoted to the rank of Cardinal-Priest of S. Croce in Gerusalemme; as such, he signed the bulls from 1 October 1178 until 8 January 1183. He participated in the papal election, 1181, which elected Pope Lucius III. He wrote an opuscle titled De Deo immortali.
- Gaetano Moroni, Dizionario di erudizione storico-ecclesiastica da S. Pietro sino ai nostri giorni vol. III, Tipografia Emiliana, Venice 1840-1861, page 13
- Philip Jaffé, Regesta pontificum Romanorum ab condita Ecclesia ad annum post Christum natum MCXCVIII, Berlin 1851, p. 678 and 835
- J. M. Brixius, Die Mitglieder des Kardinalkollegiums von 1130-1181, Berlin 1912, p. 60 no. 1